On Wed, 2022-11-09 at 01:52 +0000, Joseph Myers wrote: > On Tue, 8 Nov 2022, Xi Ruoyao via Gcc-patches wrote: > > > I'm wondering if running xz -T0 on different machines (with different > > core numbers) may produce different compressed data. The difference can > > cause trouble distributing checksums. > > gcc_release definitely doesn't use any options to make the tar file > reproducible (the timestamps, user and group names and ordering of the > files in the tarball, and quite likely permissions other than whether a > file has execute permission, may depend on when the script was run and on > what system as what user - not just on the commit from which the tar file > was built). So I don't think possible variation of xz output matters here > at present.
OK then. I'm already using commands like git archive --format=tar --prefix=gcc-$(git gcc-descr HEAD)/ HEAD | xz -T0 > ../gcc-$(git gcc-descr HEAD).tar.xz when I generate a GCC snapshot tarball for my own use. -- Xi Ruoyao <xry...@xry111.site> School of Aerospace Science and Technology, Xidian University
